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(CNN)U.S. officials say there's a notable increase in the number of unaccompanied minors and families crossing the U.S.-Mexico border, presenting worries of a possible new refugee influx.

An increase in the number of such crossings in August is unusual because it is a time of year when the number of undocumented immigrants attempting to cross tends to drop because of the danger from hot temperatures.

The U.S. faced a crisis in 2014 when as many as 10,000 children a month, and another 16,000 adults with children, began arriving at the southwestern border.

"In August, U.S. Customs and Border Protection experienced an increase from the month of July in the number of unaccompanied children and family units apprehended," said the Customs and Border Protection agency in a statement:

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The agency said it more than 4,600 unaccompanied children and more than 5,000 adults with children were apprehended at the U.S.-Mexico border.

The agency said that despite the August increase, the number of unaccompanied children apprehended crossing the border remains lower than 2014 highs.

The number of such immigrants declined after U.S. officials mounted a public campaign warning of the dangers of migrating across thousands of miles, and began sending back some immigrants to their home countries. U.S. officials are still housing many of those refugees, whose arrival in 2014 came as a surprise to Homeland Security officials.

Some U.S. officials believe widespread news coverage of the refugee crisis in Europe, with thousands fleeing Syrian and other wars, may be influencing the new spike in immigrants seeking to come to the U.S. These officials suspect more could be encouraged to make the dangerous journey after U.S. officials in the past month announced plans to accept more refugees.